A variety of pipe on the market, but the majority of copper interface components, even if some of the pipe can not use copper parts, where it is still in the interface with the faucet or to have a copper parts. However, if the copper pipe fittings connected with other pipe, pipe and fittings due to the different materials, thermal expansion and contraction of the physical and mechanical properties vary greatly, the connection of the firm naturally subject to additional challenges. Therefore, the brass and copper fittings connected, the firmness will be greatly enhanced.